On a trip this past week my wife noticed on the passenger side as she stretched her feet under the dash it was dripping water...seems like I have read that this is a AC drain that is clogged...How do I go about finding the clog and clearing it?

 

Given you're 4x4, you may have enough room to slip under your ride without a lift ? Getting it up on a Lift is better though.

Usually toward the passenger's side, and right as the Firewall drops down and turns under the chassis, you should see a open ended rubber tube just sticking out of the Firewall. Maybe it's a little higher up given your specific model ?

Use a "gentle" blast of Air up into the tube (5-10 psi) but don't thrust the tip of the Air Hose up and seal it against the tube. Just real gentle flow ! To much and you might blow the other end of the Tube off of the drain pan.
So be careful !

IF you've hit the right tube, you should see an immediate discharge of water out of it, assuming that you've run your A/C recently.

Given that you had to do this at all, and depending on why it's blocked (gunk or insulation) you may have to repeat this occasionally.

 

While I haven't seen the one on current models, the rubber tube used to be pinched shut to prevent vermin, etc from entering. Rather than using compressed air, I've had good luck poking a plastic soda straw into the drain tube. It can't damage anything and you have instant feedback cuz the water will flow thru the straw if the drain is clogged.